if nameTextField.text != nil {
      nameTextField.resignFirstResponder()
      emailTextField.isHidden = false
      nameTextField.isHidden = true
      emailTextField.becomeFirstResponder()
    } else if emailTextField.text != nil {
      emailTextField.resignFirstResponder()
      emailTextField.isHidden = true
      firstPasswordTextField.isHidden = false
      firstPasswordTextField.becomeFirstResponder()
    } else if firstPasswordTextField.text != nil {
      firstPasswordTextField.resignFirstResponder()
      firstPasswordTextField.isHidden = true
      phoneNumberTextField.isHidden = false
      phoneNumberTextField.becomeFirstResponder()
    } else if phoneNumberTextField.text != nil {
      phoneNumberTextField.resignFirstResponder()
    }